* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f5f7fa;
    color: #303133;
    line-height: 1.6;
}

#app {
    min-height: 100vh;
    max-width: 4080px;
    margin: 0 auto;
    padding: 20px;
}

button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    transition: all 0.3s ease;
}

button:hover {
    opacity: 0.8;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

input, textarea {
    font-family: inherit;
    font-size: inherit;
    padding: 8px;
    border: 1px solid #dcdfe6;
    border-radius: 4px;
    width: 100%;
    transition: all 0.3s ease;
}

input:focus, textarea:focus {
    outline: 0;
    border-color: #409eff;
    box-shadow: 0 0 0 2px rgba(64, 158, 255, 0.2);
}

input.error, textarea.error {
    border-color: #f56c6c;
}

.page {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.loading {
    text-align: center;
    padding: 40px 0;
}

.error {
    text-align: center;
    padding: 40px 0;
    color: #f56c6c;
}

.empty {
    text-align: center;
    padding: 40px 0;
    color: #909399;
}

body.welcome-page {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.welcome-container {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: 40px;
    max-width: 600px;
    width: 100%;
    text-align: center;
}

.welcome-container h1 {
    color: #333;
    margin-bottom: 10px;
    font-size: 32px;
}

.welcome-container p {
    color: #666;
    margin-bottom: 30px;
    font-size: 16px;
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.menu-btn {
    background-color: #4caf50;
    color: #fff;
    padding: 15px 30px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: background-color 0.3s;
    text-decoration: none;
    display: inline-block;
}

.menu-btn:hover {
    background-color: #45a049;
}

.menu-btn.primary {
    background-color: #4caf50;
}

.menu-btn.primary:hover {
    background-color: #45a049;
}

.menu-btn.secondary {
    background-color: #2196f3;
}

.menu-btn.secondary:hover {
    background-color: #0b7dda;
}

/* PC 端样式 屏幕宽度 ≥ 768px */
@media screen and (min-width: 768px) {
    /* 默认无菜单时的 body 宽度 */
    #app {
        max-width: 4080px;	
    }

}

/* 手机端样式 屏幕宽度 ≤ 767px */
@media screen and (max-width: 767px) {
    #app {
	max-width: 800px;
    }
}